Screen captures

Plato wrote dialogues to invite people into the conversation. For a website critiquing social websites, we could use screen captures. Is someone willing to post a screen-capture video? Here is an example on You Tube, explaining how to screen capture on a Mac: Quicktime Player X isight and screen recording, Mac. And here is a screen capture with text appearing over black: https://www.youtube.com/watch?v=eVtCO84MDj8